Manual Operation of Power Liftgate
To change the liftgate to manual operation, press OFF on the power liftgate switch. A message displays on the DIC indicating manual operation mode. See Driver Information Center (DIC) (Without DIC Buttons) on page 5‑30 or Driver Information Center (DIC) (With DIC Buttons) on page 5‑25.
With the liftgate in manual mode and all of the doors unlocked, the liftgate can be manually opened and closed.
To open the liftgate, press the touch pad on the outside of the liftgate handle and lift up. Use the pull handle to lower and close the liftgate, the liftgate latch will power close.
Always close the liftgate before driving.
If 
on the RKE transmitter or the 
on the liftgate is pressed while in manual operation mode, the taillamps will flash three times, but the liftgate will not move.
It is not recommended to drive with the liftgate open. However, if the vehicle must be driven with the liftgate open, the liftgate should be set to manual operation.
See also:
MP3 Radios with a Single CD or a Single CD and DVD
Player
To adjust the time and date:
1. Turn the ignition key to ACC/ ACCESSORY or ON/RUN, then press the button to turn the radio on.
2. Press the button to display HR, MIN, MM, DD, YYYY (hour, minute, m ...
Selecting the Right Engine Oil
Selecting the right engine oil depends on both the proper oil specification and viscosity grade.
See Recommended Fluids and Lubricants on page 11‑12. ...
Trailer Towing
If the vehicle has a diesel engine, see the Duramax diesel supplement for more information.
If the vehicle is a hybrid, see the hybrid supplement for more information.
Do not tow a trailer during br ...